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/*
* Copyright (c) 2003-2010 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef MIDISH_MIDIDEV_H
#define MIDISH_MIDIDEV_H
/*
* timeouts for active sensing
* (as usual units are 24th of microsecond)
*/
#define MIDIDEV_OSENSTO (250 * 24 * 1000)
#define MIDIDEV_ISENSTO (350 * 24 * 1000)
/*
* modes for devices
*/
#define MIDIDEV_MODE_IN 1 /* can input */
#define MIDIDEV_MODE_OUT 2 /* can output */
/*
* device output buffer length in bytes
*/
#define MIDIDEV_BUFLEN 0x400
struct pollfd;
struct mididev;
struct ev;
struct devops {
/*
* open the device or set the ``eof'' flag on error
*/
void (*open)(struct mididev *);
/*
* try to read the given number of bytes, and return the number
* of bytes actually read, set the ``eof'' flag on error
*/
unsigned (*read)(struct mididev *, unsigned char *, unsigned);
/*
* try to write the given number of bytes, and return the number
* of bytes actually written, set the ``eof'' flag on error
*/
unsigned (*write)(struct mididev *, unsigned char *, unsigned);
/*
* return the number of pollfd structures the device requires
*/
unsigned (*nfds)(struct mididev *);
/*
* fill the given array of pollfd structures with the given
* events so that poll(2) can be called, return the number of
* elements filled
*/
unsigned (*pollfd)(struct mididev *, struct pollfd *, int);
/*
* return the events set in the array of pollfd structures set
* by the poll(2) syscall
*/
int (*revents)(struct mididev *, struct pollfd *);
/*
* close the device
*/
void (*close)(struct mididev *);
/*
* free the mididev structure and associated resources
*/
void (*del)(struct mididev *);
};
/*
* private structure for the MTC messages parser
*/
struct mtc {
unsigned char nibble[8]; /* nibbles of hr:min:sec:fr */
unsigned qfr; /* quarter frame counter */
unsigned tps; /* ticks per second */
unsigned pos; /* absolute tick */
#define MTC_STOP 0 /* stopped */
#define MTC_START 1 /* got a full frame but no tick yet */
#define MTC_RUN 2 /* got at least 1 tick */
unsigned state; /* one of above */
unsigned timo;
};
struct mididev {
struct devops *ops;
/*
* device list and iteration stuff
*/
struct pollfd *pfd;
struct mididev *next;
/*
* device settings
*/
unsigned unit; /* index in the mididev table */
unsigned ticrate, ticdelta; /* tick rate (default 96) */
unsigned sendclk; /* send MIDI clock */
unsigned sendmmc; /* send MMC start/stop/relocate */
unsigned isensto, osensto; /* active sensing timeouts */
unsigned mode; /* read, write */
unsigned ixctlset, oxctlset; /* bitmap of 14bit controllers */
unsigned ievset, oevset; /* bitmap of CONV_{XPC,NRPN,RPN} */
unsigned eof; /* i/o error pending */
unsigned runst; /* use running status for output */
unsigned sync; /* flush buffer after each message */
/*
* midi events parser state
*/
unsigned istatus; /* input running status */
unsigned icount; /* bytes in idata[] */
unsigned char idata[2]; /* current event's data */
struct sysex *isysex; /* input sysex */
struct mtc imtc; /* MTC parser */
unsigned oused; /* bytes in obuf */
unsigned ostatus; /* output running status */
unsigned char obuf[MIDIDEV_BUFLEN]; /* output buffer */
};
void mididev_init(struct mididev *, struct devops *, unsigned);
void mididev_done(struct mididev *);
void mididev_flush(struct mididev *);
void mididev_putstart(struct mididev *);
void mididev_putstop(struct mididev *);
void mididev_puttic(struct mididev *);
void mididev_putack(struct mididev *);
void mididev_putev(struct mididev *, struct ev *);
void mididev_sendraw(struct mididev *, unsigned char *, unsigned);
void mididev_open(struct mididev *);
void mididev_close(struct mididev *);
void mididev_inputcb(struct mididev *, unsigned char *, unsigned);
void mtc_timo(struct mtc *); /* XXX, use timeouts */
extern unsigned mididev_debug;
extern struct mididev *mididev_list;
extern struct mididev *mididev_clksrc;
extern struct mididev *mididev_mtcsrc;
extern struct mididev *mididev_byunit[];
struct mididev *raw_new(char *, unsigned);
struct mididev *alsa_new(char *, unsigned);
struct mididev *sndio_new(char *, unsigned);
void mididev_listinit(void);
void mididev_listdone(void);
unsigned mididev_attach(unsigned, char *, unsigned);
unsigned mididev_detach(unsigned);
#endif /* MIDISH_MIDIDEV_H */
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